If we told you that we spent $2400 to right a wrong in proving something that you as a consumer should be aware of, would you believe us?

This report closely examines the ASUS Zenbook. Within the ‘Zen’, ASUS may provide either of two SATA 3 SSDs, these being the AData ‘SandForce Driven’ XM11 or the Sandisk U100. There is no price difference between the two, the product number is the same and the consumer has no way of knowing which they will receive.

The performance drop between the two is significant. Our concern, in fact, led to our investing in one of each Zenbook (AData/Sandisk), and then voiding the warranties to confirm SSD configuration, so that potential buyers have a clear view of this. We believe ASUS should be clearly identifying the SSD on exterior packaging and within specifications just as they would a CPU, especially since the SSD is responsible for the largest visible upgrade we see in computer performance today.

INTRODUCTION

We will be the first to concede that we are not the first to explore this topic as AnandTech covered it some time ago in their Asus Zenbook UX21 Review quite well and we had since received a few e-mails from unhappy customers whom had unknowingly received a system containing the SSD that was not of their choice. It seems there was no way of identifying the SSD on the exterior packaging and the first signs of SSD identification were found on the interior box which would be seen after purchase.

In fact, it wasn’t until our review of the Samsung PM830 SATA 3 SSD that we had even considered the viability of a Zenbook purchase, this being the result of an unhappy reader asking why we weren’t testing a SATA 3 mSATA SSD in a system for which it was intended, rather than on our Test Bench. He was absolutely right.

Our next stop was deep within the pages of several tech site reviews where we found a large number of AData XM11 included Zenbooks with great performance results, but we could not find a review with the Sandisk U100 SATA 3 SSD. We found it odd as the performance detailed by ASUS did match that of the included ‘SandForce Driven’ SSD but what about the Sandisk U100? It was there that we found some rather remarkable user posts (1,2,3) that opened up our eyes to something that we feel should be rectified by ASUS.

PRODUCT PURCHASE

Given this information, we decided to visit three major chain retailers and do a bit of ‘benchmarking on the go’ where we were very surprised that two of the chains no longer had the Zenbook on display, however, we were free to order online and would receive the product in a few days. That didn’t work as we leave for CEBit in beautiful Hanover, Germany in a short twenty one hours from now. We hit the third at which time the conscious decision was made to purchase one of each system. The deciding factor came from information learned that the Windows Experience Index for the Sandisk U100 was only 5.9, whereas it was significantly higher at 7.9 for the AData XM11.

Our end purchase consisted of a ASUS Zenbook UX21 with a AData 120GB SATA 3 SSD installed and a UX31 with the Sandisk U100 SSD installed. As much as some may believe that the configurations should be exact, the simple fact is that we are only testing the SSD of the system and both are Sandy Bridge systems capable of amazing SATA 3 speeds after all. We simply have no use for two exact laptops at the office.

As a bit of a side note, those familiar with SSDs are aware that ‘SandForce Driven’ SSDs such as the AData XM11 are of the 120GB capacity while the Sandisk U100 SSD is 128GB, yet both of our packages identified the internal SSD as 128GB. Given the value of SSD real estate, that loss of 8GB on a system advertised as 128GB is just a bit deceiving.

SYSTEM DISASSEMBLY

These pictures display the SSDs as they were being removed from the chassis. It is not a simple task as the chassis is secured by several very small torx screws and the SSD screw is covered by security tape which meant that removal voided the warranties.

I have a UX31 with a Sandisk U100 and I get the BSOD pretty often as well. I am not a expert, but my guess would be that all since SSD is still a pretty new technology and not that popular as the HDD it’s not yet perfect and still has some issues and bugs.

I have been with SSDs since there first release in 2007 and I wouldn’t believe that your BSODs are common because of it being a new technology. Typically there is another reason which hasn’t yet surfaced. I have been through just about every SSD on the market and run 10 or so systems and laptops and I never experience BODSs randomly.

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6 years ago

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Someone

The SandForce BSOD bug has been fixed as it has been tested and verified by AnandTech and many other publications. I don’t like SandForce, but you have to admit they (or at least Intel) have stabilized their firmware and their SSD’s are now very competitive with the rest.

The SandForce bug was overblown. I couldn’t count the numbet of drives we reviewed and tested an, to this day, I only know of one instance of a drive bricking personally. This is compounded by the fact that I have installed probably over a hundred drives in the past two years for clients in my area and they have yet to experience the issue as well

Interesting follow-up to this is that the 256GB SanDisk U100 seems to be far worse– the machine stutters and freezes with even light multitasking and can barely handle 480p local video without stuttering.

Here’s ATTO from my UX31 (results are the same even with less data on the drive):

Thank you very much. As a reviewer, it is hard to make a decision in testing, as with this review, and to decide whether to hold back and get another sample for testing or to go ahead and believe the results are similar to what others have received.

My initial decision relied upon that of other forum posts and its nice to have validation here as well.

By the way… I had been working as a performance consultant with ERP system 12 years ago. I was strange what you mention to turn off the pagefile of Windowns (Totally?), are you sure about this? (I guest that people with just 1GB can’t do it, people with 8GB can do it… but with 4GB???)

Believe it or not, I have been suggesting such since 07 and have watched the world slowly move to my side. 4GB minimum for the typical user is the recommendation. If you have highly intensive needs, I would recommend 8GB but many would be amazed how much they can get going in Win 7 before they resources suffer.

I haven’t had PF on since the day I got 4GB RAM and have never once experienced a warning or problem….and I can be fairly intensive!

Thanks for the answer! I turned off some days ago… and the performance is better (but I’m not very happy with this SDD… it is the third one I have it, and I found it very slow).

Best regards

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6 years ago

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mattseds

Unreal. I had no idea there was ever a difference offered, and found this thread while searching for potential firmware updates for the U100. I was quite sure the SSD was my issue, as there was ZERO capability to do any simultaneous disk activity. Unzipping something while surfing the net, and the net crawls because it can’t load pages into cache. Anyhow, just adding that the disabling of the page file makes a huge improvement. I’m guessing that this disk is so IO thread-limited that performing one operation while Windows swaps to the page file is enough to bring it… Read more »

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6 years ago

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mattseds

Just correcting my above that the sustained spike was 100MB/s, not 10MB/s

It is not really good. I have the pagefile turned off. But some times Windows is not working… and start a crazy state!

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6 years ago

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amb9800

@TheSSDReview:disqus, do you know of any 256GB (or larger) SSDs in the same form-factor as the U100? I’d love to replace it, but looks to be a proprietary shape/connector and incompatible with Apple’s SSD pinouts?

A bit surprised that Asus is still using the U100 in the Zenbook Prime series…

The ‘gumstick’ form factor of the Zen is similar but not compatible with its Mac counterpart, so unfortunately the OWC drive will not work. The ONLY other drive that would work is the ADATA twin of that drive that we reviewed and it is not available through consumer sales. Sorry.

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6 years ago

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amb9800

For what it’s worth, upgrading to Windows 8 CP gave me a pretty nice bump in SSD performance. A few months in, and while it’s still horrible (gets stuck while switching between desktop and Metro, had a few multi-minute full-system freezes during I/O-intensive tasks, videos are hopeless, etc.), it’s at least better than under Win 7. Also, for some reason, switching to an older version of the Intel AHCI driver gives a 5-10% bump in write performance.

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6 years ago

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Me

Running only synthetic benchmarks is not enough, I would expect to see some user scenario measurements and also some power consumption comparison. I got the Zenbook with SanDisk U100 and after 2 weeks I can say that I’m very happy.

The review displays the most realistic method of ‘true user experience’ evaluation seen today with PCMark Vantage and, as well, AS SSD Copy Benchmark is also a true copy test benchmark. There is nothing defective about the U100 whatsoever and in typical use, it would be difficult to differentiate from any other. The difficulty lies in anyone purchasing a system with this ssd for specific uses such as photography, movie editing and whatnot. It took 47 seconds to move a file….those are back to HDD days!

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7 years ago

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Lun916

I find an interesting video on YouTube. Its talking about the Sandisk SSD compared with ADATA that use in Zenbook. Check it ! LOL